Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

G*Power to the People Several years ago, German researchers developed free software, called G*Power, that calculates sample size. Every scientist should use it. Let's pretend that we are doing a study ...

To calculate the power of a test for the completely randomized design with given sample sizes, one must specify (1) the required significance level, (2) the effect size that needs to be detected, (3) ...

We consider the problem of calculating power and sample size for tests based on generalized estimating equations (GEE), that arise in studies involving clustered or correlated data (e.g., longitudinal ...

We derive an explicit form for power/sample size calculation based on these two tests. A number of simulation studies have been used to illustrate the efficiency of the tests for the case-cohort ...